Smoke-preventing apparatus.



No. 873,513. PATENTED DEC. 10, 1907.

J. P. DAVIS. SMOKE PREVENTING APPARATUS.

APPLICATION FILED NOV-10. 1906.

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No. 873,518. PATENTED DEC. 10. 1907.

' A J. P. DAVIS.

SMOKE PREVENTING APPARATUS.

APPLICATION FILED NOV.10, 1906.

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UNITED STATES PATENT oln ron.

I JOHN P. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR OF TWO-FIFTHS TO LLEWELLYN MORTON,

OF CHICAGO, ILLINOIS.

SMOKE-PREVENTING APPARATUS.

Specification of Letters Patent.

Patented Dec. 10, 1907.

To all whom it may concern:

Be it known that 1, JOHN P. DAVIS, a citizen of the United States, residing at 1604 Michigan avenue, Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Smoke- Preventing A paratus, of which the following is a speci cation.

My invention relates to an improvement in the class of furnace-attachments for preventing the generation of smoke, in firing the furnace, by automatically causing the introduction into the fire-chamber of air and steam to enhance the combustion of the freshly-fed fuel, in the act of opening the fuel-door preparatory to firing, and continuing the introduction of the supply of air and steam for a time after the fuel-door of the furnace is again closed.

The object of my invention is to provide a novel construction of apparatus in the class referred to, which shall render it simple and durable, and easily and reliably operative.

Referring to the accompanying drawings- Figure 1 is a broken view in front elevation of a furnace equipped with my improvement on each of two fuel-doors with which it is shown I to be provided, though my invention is applicable to a single fuel-door; Fig. 2, a broken section taken at the line 2 on Fig. 1, viewed in the direction of the arrow and enlarged; Fig. 3, a section taken at the line 3 on Fig. 1, viewed in the direction of the arrow and enlarged, and showing the airdoor, by dotted representation, in itsopen position; Fig. 4, an enlarged section taken at the line 4 on Fig. 1, and viewed in the direction of the arrow, and Fig. 5, a face view of the cam-carrying sheave and the segmental gear on its journaling stud, which is shown in section.

On the furnace-front 7 are represented two similar hinged fuel-doors, 8 and 9, each having an open center closed by an air-door 10, journaled at its ends in bearings, 11 and 12, on the door, to adapt it to be rotated in a vertical plane and operate as a valve for opening and closing the air-passage through the door proper. Inasmuch as the equipment for automatically opening each air-door is the same, and especially since my improvement may be used on a furnace having only one fuel-door, the following description of the mechanism for opening one air-door will suffice for both:

In suitable bearings on the furnace-front, adjacent to the door 8, is j ournaled a vertical tubular shaft or hinge-pin 13,. to which, near its lower end, is rigidly fastened, as by a setscrew 14, the member 15 of the upper hinge of the fuel-door. This hinge-pin also has bearing, immediately above the hinge-connection 15, in the lower sleeve-extension 16 of a yoke 17, in which is mounted upon the hinge-pin, and fastened thereto, as by a setscrew 18, the sleeve-extension of a horizontally-disposed miter-gear 19. On a horizontal stud 20, screwed into a bearing 21 on the yoke 17, is journaled a wheel 22, shown in the form of a sheave, and carrying on its outer face an arc-shaped cam-track 23 pivotally connected at one end with the face of the sheave, as represented at 24, and adjustably connected therewith at its opposite end, as represented at 25, for the purpose hereinafter explained. The stud 20 also has journaled upon it a segmental miter-gear 26, to mesh with the gear 19, and provided with a radial finger 27, at an end of the gear-teeth,

'extending into the path of a shoulder 28 forming an abutment on the sheave-face. rod 29 extends vertically through and upward beyond the hinge-pin 13, and has pro jecting laterally from its upper end a roller 30 journaled on the rod to engage the outer convex surface of the cam-track 23. lower end, the rod 29 passes through a longitudinally slotted thimble 31, with which it is en aged by a nut 32 on its lower projectin en and in this thimble is rotatably an loosely confined the adjacent end of the journal in the bearing 12, which journal-end is extended into a bent arm, or species of crank, 32*, to enter the thimble 31, whereby vertical movement of the rod 29 will operate to turn. the air-door 10 on its journals. This loose slotted-thimble connection between the reciprocable rod and the air-door, which is essentially in vertical alinement with the axis upon which the fuel-door swings, permits the bent arm 32, in describing the arc in 'which it turns, to move freely, since the slot in the thimble allows the latter to reciprocate and thus compensate for the crankmotion of said arm.

At 33 is represented, in Fig. 1, a steampipe leading from a source of supply (not shown) and discharging at 34 and 35 into the furnace-chamber; and this pipe contains a shut-off valve 36 (of the variety which seats At its downwardly to shut off the steam), having its stem connected with a lever 37, one end of which is fulcrumed at 38, the other end being connected with the piston-rod 39 of a suitable dash-pot 40; and to assist in overcoming the dash-pot resistance, the lever is provided with a weight 41, which should be adjustable. Between its ends, the lever is connected by a pitman-rod 42 eccentrically with the face of the sheave 22.

The operation is as follows: In opening the fuel-door 8, as for firing, the hinge-member 15 turns the shaft or pin 13, and with it the gear 19 to rotate the segment 26, the finger 27 on which encounters the abutment 28 on the sheave 22 to turn the latter and ride the cam-track 23 against the roller 30, with the result of raising the rod 29 and with it the thimble 31, and thereby turning the cranklike arm 32 to open the air-door 10 to the position in which it is indicated by dotted lines in Fig. 3. Thus opening the door 10 admits air to the fuel-chamber; but inasmuch as it is desirable that the inflow of air shall be as low as possible, as to its point of entering the furnace-chamber, a depending rigid deflector-plate 43 (Fig. 3) is provided on the inner side of the fuel-door to direct the course of the air downward and cause the supply thereof to enter the furnace-chamber mainly below the inclined open air-door 10. The eam-traek 23 serves, by adjusting it, to efliect opening of the air-door to a greater or less extent, depending on whether the adj ustable end of the track is set farther away from or nearer toward the center of the sheave. In rising, the rod 29, by its pitman-connection 42 with the lever 37, raises the latter to open the valve 36 for admitting steam into the furnace-chamber, and also raises the piston of the dash-pot 40. Closure of the door 8, after the firing operation is performed, leaves the air-door 10 and the valve 36 open for a time, to permit the supply of air and steam to be continued until they are automatically closed, since the closure of the fueldoor merely turns with it the hinge-pin 13 and gear 19, and the turning of the latter turns the segmental gear 26 in the direction to remove its finger 27 away from the abutment 28 on the sheave, which is thus free to slowly follow the segmental gear under the stress of the weight 41 in overcoming the resistance of the dash-pot 40, to cause the sheave, by the pitman-connection thereof with the lever 37 to gradually resume its normal position to close the valve 36 and permit lowering of the rod 29, under the control of the cam-track 23, to turn the air-door 10 to its closed position.

Where two fueldoors, 8 and 9, are provided, as shown, each equipped. with my improvement, to adapt with air-doors to be simultaneously opened, or closed, by the opening or closure of one, and to be controlled by one and the same dash-pot, I provide the wheels 22 as corresponding sheaves, and connect them together in any suitable manner, as, for example, through the medium of a. crossed-belt 44, to cause them to operate correspondingly in the matter of opening and closing the respective air-doors.

IVhile my invention consists in the gen eral, as well as the more specific, construction of the mechanism which I have devised for the purposes herein explained, the feature of the direct connection between the rotary air-door and its operating mechanism is of great importance, since it eli'eets holding of the air-door open against jarring, rough handling of the fuel-door in closing it, and any other cause tending to close the air-door prematurely, because the connection, as shown, of the rod 29 with the air-docn? is of the nature of a comparatively short crank, which opposes resistance to movement of the air-door altogether too great to be overcome by any such ordinary cause tending to close it. The invention is not, however, intended, in this behalf, to be limited to the crank-lil e form of the direct connection, as it maybe any other form thereof with a recim'oeally supported rod coinciding or approxinlately coinciding with the axis upon which the fueldoor swings.

\Vhat I claim as new and desire to secure by Letters Patent is:

1. In a furnace, the combination with a hinged fuel-door containing an air-inlet, of an air-door movably supported thereon to open and close said inlet, a reciprocably supported rod, a loose crank-like connection between said air-door and rod cmistructed to adapt said rod at the point of its said connection to be maintained in a position coincident nith the axisupon which said fuel-door swings, and means for moving said rod to swing the air-door.

2. In a furnace, the combination with a hinged fuel-door containing an air-inlet, of an air-door rotatably journaled thereon to swing on an axis at an angle to that upon which said fuel-door swings for opening and closing said inlet, a recimoeably supported rod, means for moving said rod, and a loose Clft11l(lil(6 connection between said airdoor and rod constructed to adapt said rod at the point of its said connection to be maintained in a position coincident with the axis upon which said fuel-door swings.

3. In a furnace, the combination with a hinged fuel-door, of an a.irdoor journaled thereon and provided near its outer end ith a bent arm, a reeiprocable rod and means for raising it, and a loose connection between said bent arm and rod constructed to adapt said rod at the point of its said coiniertion to be maintained in a position coincident with the axis upon which said fuel-door swings.

4. In a furnace, the combination with a hinged fuel-door of an air-door journaled thereon and provided near its outer end with a crank-like arm, a thimble with which said arm is loosely engaged, a reciprocable rod loosely connected with said thimble in a manner to adapt said red at the point of its said connection to be maintained in aposition coincident with the axis upon which said fueldoor swings whereby the raising of the said rod will open said air-door, and means for maintaining said air-door in open condition after the fuel-door is closed.

57 In a furnace, the combination with a hinged fuel-door, of an air-door journaled thereon, a reciprocable rod, means for raising the rod, a loose crank-like connection between said air-door and rod constructed to adapt said. rod at the point of its said connection to be maintained in a position coincident with the axis upon which said fuel-door swings, and means for maintaining said airdoor in open condition after the fuel-door is closed.

6. In a furnace, the combination with the front, of a fuel-door, a tubular hinge-pin carrying a miter-gear, and to which said door is connected, an air-door journaled in said fueldoor, a vertically reciprocable rod passing through said hinge-pin, a direct connection between said rod and air-door, a wheel provided with a cam engaging said rod to raise it, a segment-gear loosely mounted on an axis common to it and said wheel and meshing with said miter-gear, and means for separately engaging said wheel and miter-gear, for the purpose set forth.

7. In a furnace, the combination with the front, of a fuel-door, a tubular hinge-pin carrying a mitergear, and to which said door is connected, an air-door journaled in said fueldoor, a vertically reciprocable rod passing through said hinge-pin and carrying near its upper end a roller, a direct connection between said rod and air-door, a wheel carrying a cam adapted to engage said roller to raise the rod by turning the wheel, a segmental gear loosely mounted on an axis common to it and said wheeland meshing with said miter-gear, and means for separately engaging said wheel and miter-gear, for the purpose set forth. L

8. In a furnace, the combination with the front, of a fuel-door,- a tubular hinge-pin to which said door is connected, a miter-gear carried by said pin, an air-door j ournaled in said fuel-door, a vertically reciprocable rod passing through said hinge-pin and carrying near its upper end a roller, a direct connection between said rod and air-door, a wheel provided with a cam adapted to be engaged by said roller to raise the rod by turning the wheel, a shoulder on said wheel, and a segmental gear loosely mounted to. mesh with said miter-gear, on an axis common to it and said wheel and provided with a finger adapted to engage said, shoulder, for the purpose set forth.

9. In a furnace, the combination with a hinged fuel door, of a rotatable air-door thereon, a vertically reciprocable rod, means for raising the rod, a loose crank-like connection between said air-door and rod constructed to adapt said rod at the point of its said connection to be maintained in a position coincident with the axis upon which said fuel-door swings, a steam supply pipe adapted to discharge into the furnace, a valve in said pipe, a lever connected with said valve and with said rod to open and close the valve by raising and lowering the rod, and a dashpot operatively connected with said lever to retard the lowering of said rod, for the purpose set forth.

10. In a furnace, the combination with the front, of hinged fuel-doors, each carrying a rotatable air-door, reciprocably supported rods, connecting means between each rod and the adjacent air-door operating to open and close the latter by raising and lowering the rod, said connecting means being a loose crank-like connection between the respective air-doors and rods constructed to adapt each said rod at the point of itssaid connection to be maintained in a position coincident with the axis upon which said fuel-door swings, means for raising each rod, and a connection between the moving means of both rods to cause them to operate correspondingly, for the purpose set forth.

11. In a furnace, the combination with the front, of a pair of fuel-doors, tubular hingepins, with each of which one of said doors is connected, a reciprocable rod extending through each hinge-pin, an air-door rotatably journaled in each fuel-door, a direct connection between each rod and the adjacent air-door, a miter-gear on the hinge-pins, wheels, each provided with a cam engaging with a rod to raise it, a segmental gear for each wheel loosely mounted on an axis common to it and the wheel, to mesh with-the adjacent miter-gear, and separably engaged by the adjacent wheel, and a connection between said wheels operating to cause the turning of one to turn the other, for the purpose set forth.

12. In a furnace, the combination with the front, of a fuel-door, a tubular hinge-pin to which said door is connected, a yoke on the furnace front in which said hinge-pin is journaled, a miter-gear on said hinge-pin, a vertically reciprocable rod passing through said hinge-pin and carrying near its upper'end a roller, an air-door journaled in said fuel-door, a crank-like arm on said'air-door, a thimble connected with said rod and with which said arm is rotatably engaged, whereby the airdoor is opened and closed by raising and lowering the rod, a wheel journaled in said yoke, a shoulder on said wheel, a segmental gear loosely mounted to mesh with said to be opened and closed by raising and lower- 10 miter-gear, on an axis common to it and said ing the rod, a dash pot operatively connected Wheel, a finger on said segmental gear adapt- With said lever to retard the lowering ol said ed to engage said shoulder, a cam on the face i rod, and a pitman connecting the lever with 5 of said Wheel adapted to be engaged by said I said Wheel, for the purpose set forth.

roller to raise the rod by turning the Wheel, JOHN P. DAVIS. a steam-supply pipe adapted to discharge In presence ofinto the furnace, a valve in said pipe, a lever C. W. WASHBURNE- connected With said valve and with said rod J. H. LANDES. 

